Barrel sluice



FIG. 1 is a perspective view of a barrel sluice showing my new design;

FIG. 2 is a left side view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines shown in the drawings are to show portions of the barrel sluice which for no part of the claimed design. 

CLAIM The ornamental design for a barrel sluice, as shown and described. 